Firefox 48 to implement media stack coded in Rust

Mozilla announced that the first Rust components will arrive in Firefox 48, scheduled for publication on August 2, 2016.

Development of Rust began seven years ago as a safer alternative to C++, to deliver a more secure browsing environment by reducing potential vulnerabilities like memory exploits. The first Rust component that will make it into Firefox 48 will be the Rust Media Parser:

The Rust Media Parser will be the first section of code to be applied to the main Firefox build. The parser was chosen because "every time a browser plays a seemingly innocuous video ... it's reading data delivered in a complex format and created by someone you don't know and don't trust".

As a result, watching video is one of the most vulnerable times in any browser user's experience, and moving it over to Rust will create a significantly safer environment.
Mozilla's own testing has shown that the Rust-based parser has identical results in terms of performance.